연구논문집

Korea Institute of Machinery & Materials (한국기계연구원)
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Development of New Titanium Alloys for Castings

주조용 티타늄 신합금 개발

  • 김승언 (한국기계연구원 재료공정연구부 고강도재료그룹) ;
  • 정희원 (한국기계연구원 재료공정연구부 고강도재료그룹) ;
  • 현용택 (한국기계연구원 재료공정연구부 고강도재료그룹) ;
  • 김성준 (한국기계연구원 재료공정연구부 고강도재료그룹) ;
  • 이용태 (한국기계연구원 재료공정연구부 고강도재료그룹)
  • Published : 1999.12.20
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Abstract

A new titanium alloy system. Ti-xFe-ySi (x,y=0-4 wt%). was designed and characterized with the point at low cost and high strength for casting applications. Fe improved room and elevated temperature mechanical properties owing to solid solution hardening and beta phase stabilization. Si yielded titanium silicides and Si addition over 1 wt% resulted in poor ductility due to coarse silicide chains at prior beta boundaries. The optimum composition was found to be Ti-4Fe-(0.5-1)Si in the viewpoint of tensile strength and ductility which are comparable to the Ti-6Al-4V. The metal-mould reaction was also examined for Ti-xFe and Ti-xSi binary alloy system. The thickness of surface reaction layer w as not affected significantly with Fe content, while it was decreased with Si content. In the Ti-4Si alloy, no reaction layer was found. The depth of surface hardening layer was about $200\mum$ regardless of the mould materials.

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